Error Occured

d:\local\Temporary ASP.NET Files\root\7f3cdb87\768c5a1a\App_Web_news.cshtml.a56db689.jbfzao2l.0.cs(51): error CS0234: The type or namespace name 'News' does not exist in the namespace 'Umbraco.Web.PublishedContentModels' (are you missing an assembly reference?)